Triggering from a specific column update

From: "Bob Pawley" <rjpawley(at)shaw(dot)ca>
To: "Postgresql" <pgsql-general(at)postgresql(dot)org>
Subject: Triggering from a specific column update
Date: 2009-11-15 23:36:47
Message-ID: 7B52BA610052463BB8F5840CC8A7C366@desktop
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"PostgreSQL does not support specific column updates in triggers."

I found this statement on a blog.

Is there a workaround for this?

I've attempted using 'new' (refering to the specific column) without success.

Bob

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